/**
 * 对象类型
 * @flow
 */

const obj1: {foo: string, bar: number} = {foo: 'string', bar: 100}
const obj2: {foo?: string, bar: number} = {bar: 100}
const obj3: {[string]: string} = {}
obj3.key1 = 'value3'
obj3.key2 = 100














